linux-kernel - Re: [PATCH 2/3] x86/vector: Replace IRQ_MOVE_CLEANUP

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Date:   Tue, 20 Jun 2023 10:37:05 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Xin Li <xin3.li@...el.com>, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, iommu@...ts.linux.dev,
        linux-hyperv@...r.kernel.org, linux-perf-users@...r.kernel.org,
        x86@...nel.org
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, steve.wahl@....com, mike.travis@....com,
        dimitri.sivanich@....com, russ.anderson@....com,
        dvhart@...radead.org, andy@...radead.org, joro@...tes.org,
        suravee.suthikulpanit@....com, will@...nel.org,
        robin.murphy@....com, kys@...rosoft.com, haiyangz@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, dwmw2@...radead.org,
        baolu.lu@...ux.intel.com, peterz@...radead.org, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, irogers@...gle.com,
        adrian.hunter@...el.com, xin3.li@...el.com, seanjc@...gle.com,
        jiangshanlai@...il.com, jgg@...pe.ca, yangtiezhu@...ngson.cn
Subject: Re: [PATCH 2/3] x86/vector: Replace IRQ_MOVE_CLEANUP_VECTOR with a
 timer callback

On Mon, Jun 19 2023 at 16:16, Xin Li wrote:
> +/*
> + * Called with vector_lock held
> + */

Such a comment is patently bad. 

> +static void __vector_cleanup(struct vector_cleanup *cl, bool check_irr)
>  {
        ....

        lockdep_assert_held(&vector_lock);

Documents the requirement clearly _and_ catches any caller which does not
hold the lock when lockdep is enabled.

Thanks,

        tglx